Diodes Incorporated PI7C9X2G304SVAFDEEX

Overview

PI7C9X2G304SVAFDEEX from Diodes Incorporated is a PCI Express Gen 2 packet switch with 3 ports (1 upstream + 2 downstream), 4-lane PCIe 2.0 interface per port, 128-pin LQFP package, 1.05 V core supply, and support for transparent bridging, VC arbitration, and configurable TC/VC mapping. It routes TLPs in embedded computing, industrial control backplanes, and modular I/O expansion systems.

For engineers reviewing the PI7C9X2G304SVAFDEEX datasheet, PI7C9X2G304SVAFDEEX pinout, PI7C9X2G304SVAFDEEX application, or PI7C9X2G304SVAFDEEX equivalent, key selection criteria include lane count flexibility (x4/x2/x1 per port), EEPROM-based configuration, SMBus/I²C system management, and compliance with PCIe Base Spec 2.0 and ECN for L1 Substates.

Technical Context

The PI7C9X2G304SVAFDEEX implements a full PCIe 2.0 transaction layer with TLP decapsulation/encapsulation, flow control credit management, and strict ordering enforcement across three logical ports. Its physical layer supports receiver equalization, programmable transmitter swing (–3.5 dB to –6 dB de-emphasis), and electrical idle latency under 2 µs.

Routing logic supports both address-based and ID-based forwarding, with configurable TC/VC mapping tables stored in internal registers or external EEPROM. The device operates in transparent bridge mode only-no root complex or endpoint functionality-and requires no host software driver beyond standard PCIe enumeration.

Key Specifications

Pinout & Package

PI7C9X2G304SVAFDEEX is housed in a 128-pin LQFP package with exposed thermal pad. Pin assignments are defined per DS41218 Rev 11-2 Section 4.1, including dedicated PCIe differential pairs (TX/RX), port status signals (PORTSTATUS_L1.1_SEL), SMBus lines (SCL/SDA), JTAG boundary scan (TCK/TMS/TDI/TDO), and multi-function configuration straps (STRAP0–STRAP5).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCIe Gen 2 packet switching applications.

Compared with ASM1083, PI7C9X2G304SVAFDEEX enables true multi-port fan-out and advanced power management; compared with PI7C9X2G604SV, it reduces BOM cost and thermal load while retaining identical configuration methodology and software compatibility.

Availability

PI7C9X2G304SVAFDEEX is available at Aetrix Electronics and suitable for industrial backplane expansion, modular test equipment, embedded vision processing nodes, and ruggedized edge gateways requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for PI7C9X2G304SVAFDEEX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and integrated circuits headquartered in California, specializing in high-reliability interface, power management, and signal integrity solutions for industrial and automotive markets.

The PI7C9X2G304SVAFDEEX belongs to Diodes' PCIe Packet Switch product line, engineered specifically for deterministic, low-latency PCIe Gen 2 interconnect in space-constrained, thermally demanding embedded systems.

FAQ

Does PI7C9X2G304SVAFDEEX support PCIe Gen 3?

No. The device is strictly PCIe Gen 2 (5.0 GT/s) compliant and does not negotiate or operate at Gen 3 speeds. Attempting Gen 3 link training will result in fallback to Gen 1 or link failure. Its SerDes architecture lacks Gen 3 equalization and 8b/10b encoding support.

Can the upstream and downstream ports operate at different lane widths simultaneously?

Yes. Each port's lane width (x1/x2/x4) is independently configured via strap pins or EEPROM. For example, upstream may run x4 while downstream ports operate at x2 and x1 respectively, subject to total 4-lane resource allocation.

Is an external EEPROM mandatory for operation?

No. Strapping pins alone can configure basic topology and power modes, but EEPROM is required for advanced features like VC mapping, L1.1 enablement, and custom TLP routing rules. Default strapping yields functional x4-x2-x2 operation without EEPROM.

What thermal design guidance applies to the LQFP package?

The exposed thermal pad must be soldered to a minimum 4 cm² internal copper pour connected to ≥2 thermal vias (0.3 mm diameter, filled) per via. Ambient temperature must stay below 70°C to maintain junction temperature ≤105°C at full x4/x2/x2 operation.